4.16 APF has the same response curve as all the other versions. BArry N1EU
On Thu, Jan 27, 2011 at 8:16 PM, Barry N1EU <barry.n...@gmail.com> wrote: > I'll check the APF in 4.16 after work and see if it's any different. > > Barry N1EU > > > On Thu, Jan 27, 2011 at 7:58 PM, Steve Ellington [via Elecraft] < > ml-node+5967599-613958550-2...@n2.nabble.com<ml-node%2b5967599-613958550-2...@n2.nabble.com> > > wrote: > >> FW pre-beta 4.16 release was actually the first to have APF, not 4.17. >> Here's an interesting comment made shortly APF was finally released to the >> >> public. >> http://elecraft.365791.n2.nabble.com/K3-APF-td5735159.html#a5736718<http://elecraft.365791.n2.nabble.com/K3-APF-td5735159.html?by-user=t#a5736718> >> >> >> >> Steve >> N4LQ >> ----- Original Message ----- >> From: "Arie Kleingeld PA3A" <[hidden >> email]<http://user/SendEmail.jtp?type=node&node=5967599&i=0>> >> >> To: <[hidden email]<http://user/SendEmail.jtp?type=node&node=5967599&i=1>> >> >> Sent: Thursday, January 27, 2011 6:44 AM >> Subject: [Elecraft] APF measurements: FW 4.17 better results by 2 dB >> >> >> > Hello all, >> > >> > Did some measurements on the different frimware versions. This time not >> > a BW-plot but I measured S+N/N ratio's. >> > >> > >> > I have no lab equipment but I have a K3 with dBV measurements, XG2 and >> > the stepped attenuator from elecraft. >> > I measured the difference of the K3 dBV-reading in signal off (=N) and >> > signal on (=S+N) >> > AGC off, mode CW, 400Hz BW and 400Hz Roofing. >> > RX gain of the K3 has been calibrated with XG2 and the K3 utility. >> > >> > >> > This is what I found. >> > >> > _FW 4.25 and 4.21 (both give the same measurement values):_ >> > At MDS level (stepped att on 20dB to reach this level) >> > normal 400 Hz BW: S+N/N = 3dB (as expected, hi) >> > 400 Hz BW + dual PB: S+N/N = 10 dB >> > >> > Now signal level 6dB under MDS (26dB att instead of 20dB): >> > normal 400 Hz BW: S+N/N = 0.5 dB >> > 400 Hz BW + dual PB: S+N/N = 4 dB >> > >> > >> > _FW 4.17_ >> > At MDS level (stepped att on 20dB) >> > normal 400 Hz BW: S+N/N = 3dB (as expected) >> > 400 Hz BW + dual PB: S+N/N = 12 dB (THIS is 2 dB BETTER) >> > >> > Now signal level 6dB under MDS: >> > normal 400 Hz BW: S+N/N = 0.5 dB >> > 400 Hz BW + dual PB: S+N/N = 6 dB (THIS is 2dB BETTER) >> > >> > >> > There are probably people that can measure this far more better than I >> > did with better equipment. >> > But this is what I can come up with here. >> > >> > 73, >> > Arie PA3A >> > >> > >> > >> > Op 27-1-2011 0:52, Barry N1EU schreef: >> >> Forget it - full stop! >> >> >> >> I just ran a spectral analysis of the current firmware versus the very >> >> first >> >> APF implementation (mcu 4.17 dsp 2.65) from 11/3/10 AND THE PLOTS ARE >> >> ABSOLUTELY CONGRUOUS! The APF implementation hasn't changed a bit (or >> a >> >> byte). >> >> >> >> Have a look: http://n1eu.com/k3apf.gif >> >> >> >> magenta and green plots are taken with width = 200hz >> >> aqua and yellow plots are taken with width = 100hz >> >> >> >> Barry N1EU >> > ______________________________________________________________ >> > Elecraft mailing list >> > Home: http://mailman.qth.net/mailman/listinfo/elecraft >> > Help: http://mailman.qth.net/mmfaq.htm >> > Post: mailto:[hidden >> > email]<http://user/SendEmail.jtp?type=node&node=5967599&i=2> >> > >> > This list hosted by: http://www.qsl.net >> > Please help support this email list: http://www.qsl.net/donate.html >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden >> email]<http://user/SendEmail.jtp?type=node&node=5967599&i=3> >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> >> >> ------------------------------ >> If you reply to this email, your message will be added to the discussion >> below: >> http://elecraft.365791.n2.nabble.com/APF-tp5963894p5967599.html >> To unsubscribe from APF, click >> here<http://elecraft.365791.n2.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=5963894&code=YmFycnkubjFldUBnbWFpbC5jb218NTk2Mzg5NHwtMTUyMTIxNjYw>. >> >> > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
